Complete the sentence with could or the past form of be able to, using the exact phrase in brackets: Throughout his years as a field geologist, Omar ___ without a compass. (read maps)

توضیح

Could read maps presents map-reading as a skill Omar possessed throughout an extended past period, and was able to read maps is also standard for that general ability. Managed to read maps would instead suggest success on a particular occasion rather than an enduring skill.